| Waimanu Temporal range: Paleocene,
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| Tarsometatarsus of the holotype | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Sphenisciformes |
| Genus: | †Waimanu Slack et al. 2006 |
| Type species | |
| †Waimanu manneringi | |
Waimanu is a genus of early penguin which lived during the Paleocene, soon after the Cretaceous–Paleogene extinction event, around 62–60 million years ago. It was about the size of an emperor penguin (1 metre). It is one of the most important bird fossils for understanding the origin and evolution of birds because of the time period it comes from, and the position of penguins near the base of the bird family tree.
Waimanu was a very early member of the Sphenisciformes, the order that includes modern penguins. However, although it was probably flightless like all modern penguins, with wings specialized for wing-propelled diving, its wing bones do not yet show the extreme specializations modern penguins have for an aquatic lifestyle.[1] It may have resembled a flightless loon or diver in body shape, and possibly the great auk in its manner of locomotion.